Investigation on stiffness and damping of transient non-Newtonian thermal elastohydrodynamic point contact for crowned herringbone gears

• Published in: Tribology international 2019-09, Vol.137, p.102-112
• Main Authors: Xiao, Zeliang, Shi, Xi
• Format: Article
• Language: English
• Subjects: Crown modification; Damping; Elastohydrodynamic point contact; Herringbone gear; Herringbone gears; Lubrication; Maintenance management; Mathematical models; Oil film stiffness and damping; Parameters; Point contact; Stiffness
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2019.04.041

The stiffness and damping models of elastohydrodynamic point contact for herringbone gears with crown modification both in normal and tangential directions are developed. The lubrication performance of crowned herringbone gears in transient non-Newtonian thermal elastohydrodynamic point contacts are investigated to validate the developed models. The effects of operating and geometric parameters of crowned herringbone gear on stiffness and damping of elastohydrodynamic point contact are analyzed. The results show that in herringbone gear transmission, crown modification significantly affects oil film stiffness and damping. Low rotation speed substantially increases the damping. Helix angle contributes to the tangential stiffness and damping. This indicates that rationally selecting parameters can obtain appropriate oil film stiffness and damping to alleviate impact and vibration of herringbone gears. •Stiffness and damping models of EHL point contact are developed.•Transient non-Newtonian thermal EHL analysis for herringbone gears is conducted.•Oil film Stiffness and damping between herringbone gear pairs are investigated.•Crown modification has opposite effects on normal and tangential stiffness or damping.•Helix angle plays a significant role in stiffness and damping in tangential direction.